Summarizing three research projects, this report evaluates effects on students of secondary teachers' strikes in Ontario. The most important of the strikes examined is the stormy Metropolitan Toronto strike that stretched from November 12, 1975 to January 19, 1976. The studies were limited by the fact that they were begun after the strike was over and by lack of cooperation from teachers. The first study found no effect of strikes on student grades. The second study covered student attitudes toward teachers and the strike and found that of the substantial minority who reported the strike affected ability and motivation, most reported a negative effect. The third study reviewed data on dropouts from grades 9-13, interviewed dropouts, and concluded that strikes have impact on dropping out and on transitions to postsecondary education. Overall, the three studies suggest that strikes are most likely to have a negative effect on the academic learning of students in senior grades and in particular on learning in subjects like math and science where learning is cumulative. Although the studies did not focus on the effects of the strikes on teachers, informal contacts with teachers suggested that teachers after the strike were less idealistic about viewing teaching as a calling rather than a job. (Author/JM)